Delta Air Lines Inc. revenue for the last year amounted to 49.53 B EUR, the most of which — 49.53 B EUR — came from its highest performing source at the moment, Airline, the year earlier bringing 42.61 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought Delta Air Lines Inc. 37.01 B EUR, and the year before that — 35.95 B EUR.